Personally depends on the situation and the paint scheme.

If they're painted as say Ultramarines and you play them as wolves it might bug me a little but i'd still let them be used. Just remember you can take stuff from space wolves and BA (eg no wolves in a storm raven). I've seen a lot of standard marines "counts as" BA just so people can get more stuff into their army.

Apoc is obviously different as you say theres multiple chapters on the field