The engines might be the same, which does shape the package a little, but the overall concept is different so I wouldn't draw conclusions for Merc from AM.The Aston does look potentially quite good. However, if it is, I expect the Merc to be even better.
It would be crazy if Merc get beaten by one of the teams they supply engines to.
I think the AM will be good but their consistency in races won't. It's a good step for them regardless.