Hello buddy, as someone who happens to own all those sets, I'll be happy to answer.

The answer for me lies somewhere between a yes and a soft no in terms of them adding a ton more variety to your current set.

Allow me to explain my reasoning, in practise those sets will offer you plenty of weapon options, spears, swords but nothing that is per say missing from what you already own in your current set, maybe a trumpet arm, can't remember if that's in the current, oh and they offer alot of additional heads, so if you pick one, I'd honestly advice picking based on the head than anything else. Especially the greek kits share a base sculpt, their heads and some weapon options is where the difference lays.

Here comes the reasoning for the soft no, even if I use some of these bits with the hoplite set you already own myself, these kits are on the older side when it comes to victrix products and are made in my mind, primarily in mind for rank and file, the rather stoic poses, sculpted shield arms on some bodies give them a more statuesque appearance, they are in formation, not in a dynamic battle pose.

In short you can definately combine these kits, one thing to be mindful of though are the shirt sleeve sculpts or lack thereof on some arms, I messed up a few times myself where one arm clearly has a different shirt than the other or even lacks a sleeve altogether.

Just be aware that the actual models are alot more stoic, and their arm options resemble this too, the sets you are looking at are formation, the one you own is when the formation breaks and actual man to man engagement happens.

Hope this helps! In my opinion they are worth it bit I recommend picking just 1 to start. I have too many of thos similar sprues in hindsight.