It sounds like some may struggle with half the Aircraft, fine, remain "Just an Engineer".
With the ever merging technology of the newer types, the line between B1 and B2 is closing. You may/will be a little weaker in your "new" trade, but everyone has to start somewhere.
Over a new LAME, you will however have had many years experience in systems, procedures, rules/regs etc etc to apply to the other half. You can't be in two places at once, you won't get double the pay, but you will eventually be twice the Engineer!
You need to market and challenge yourself or be happy to slip behind, just don't
about it!