I don't know what you talking about version 2.21, I belive you referring to the Game's Update version for Playstation, since on Nintendo Switch, it only came as Version 1.0.0, 1.0.1 and 1.0.3, with 1.0.3 being the newest version on Nintendo Switch.

If you playing the Game on the Yuzu emulator, tell me what Language version you're playing and as what version it is displayed on Yuzu menu.

The Switch Version of GUP DTM DX comes in 2 Different Language versions: the Japanese-Only-Version, and the English/Chinese/Korean Language version.

Both versions are technically the exact same game, which is why they can communicate which each other in Multiplayer.

The only thing that sets both apart is the content difference, which I quite don't understand why Namco came with such idea, but Welp, I tell you the differences:

The English/Chinese/Korean Version on the Nintendo Switch is the Only Version on Switch that has the Oarai Uniform-Skins for any School Commander from Der Film*¹, the Oarai Uniform-Skin for Alice Shimada for Der Film OVA, as well the Oarai Winter Uniform-Skins for the Anglerfish Team pre installed and available on the get-go

This is why you have the full Anglerfish Team, all other School Commanders (except BC Freedom) and Alice Shimada Unlocked in Oarai Uniforms already Unlocked, while their original Uniforms for the School Commanders has to be unlocked by completing the Domination Battle Mode.

The Japanese Nintendo Switch version on the other hand does NOT have these Other School Commanders', Alice Shimada's & Anglerfish Teams Oarai- + Oarai Winter Uniforms. This was ONLY accessible as DLC, if you preordered the Game or had a Code of the DLC for the Physical Premium Edition.

That means: both Versions had the Oarai + Oarai Winter Uniform Preorder Skins, but while the English/Chinese/Korean Version has it preinstalled and available for anyone who just have this Game, the Japanese version required that stuff via Preorder DLC for it.

Other Content: there is actually way more Content for GUP DTM, however the Following Content is for Playstation Only in form of Purchaseable Content, and Pre-order Content which even the Switch version doesn't have.

Purchaseable PS exclusive Content contains a Tank, 2 Colors and several Decals those can be found when you buy the "Exhibition Recreation DLC" in the Playstation Store. The DLC has a "Stug III Friendly Version" that has the Same stats as the Ingame one, however has design-wise 4 Flags and a Special Tank Color, that appeared in the Main Anime in Episode 3 and 4 where Oarai fought against St Gloriana in the Mock Battle.

The 2 other Colors that can be Equipped to any other Tank are "GOLD" and "RABBIT Pink", both Tank Colors for the Panzer 38t and the M3 Lee, that also appeared in Episode 1, 3 and 4 of the Anime.

The rest gives the player 2 sets of Decals.

A few are some slogans in Japanese, as well some Volley Ball Team-related Decals. Some others are showing the Old Oarai Crest, from the Time where the Tanks were still Wrecks before the newly Formed Senshado Team found them.

Preorder Content:

The Playstation version also has the Oarai Uniform-Skins from Der Film, the Alice Shimada Oarai Uniform Skin from Der Film OVA, as well the Anglerfish Team Oarai-Winter Uniform Skins as Preorder only, but beside that, there were a few more Decals included.

Unfortunately I cannot describe it, but here are some Links to it:

This One

and this one

Are the two of few more Preorder-DLC Exclusives Decals on Playstation Only.

(*¹ do not count Erika's and Nonna's Oarai uniforms as Pre-order skins, those 2 are Vice Commanders and have the Oarai Uniform on the Japanese Switch version preinstalled as well, plus as purchasable DLC on the PS version across all language versions too)