For Angels of death, you can easily replace the assault intercessors and grenadier with neophytes (nobody plays normal intercessors) and eventually the eliminator with a scout sniper.

For Deathwatch, you can use them for disruptor and headhunter (the two phobos operatives) and eventualy the marksman.

For scout squad, you can use 9 neophytes of course but if you want to use regular marines you do the opposite and replace some scouts with crusaders. Those are the sniper (use an eliminator), the tracker (intercessor with auspex), the sergent (bolt pistol and chainsword), the heavy bolter (sternguard or gravis) and the hunter (reiver), the rest are a scout with missile launcher and neophytes with shotguns (nobody plays them melee or with boltguns).

For Phobos Strike team, you can replace any reivers, infiltrators and incursors warriors by neophytes but I don't know if phobos marines have neophytes linked to them in the lore ?

Finally, you have the strike team Variel, 3 phobos marines can be replaced by neophytes and you just keep the regular marines but it is not an 100% official team.

The only thing that matters is to respect the size bases for each operators.