To answer the moral question, I think you are right to at least pursue the same terms as your previous colleagues were offered. That I think is without question.

It's a different answer all together if you had asked if you are entitled to the same terms from a legal sense. I would suspect the waters would be very muddy indeed! I think you need to decide if you want to put yourself through what could be a lengthy and possibly disappointing series of events, or do you just put it all behind you and move onto better things?

Me personally, I'd pursue it if my Union thought I had a chance!

Have you thought about offering to buy up all the assets of company A with the package they have offered you as way of meeting in the middle? I think we both know who could ultimately benefit from a deal like that

Cheers

Cris