Hi Gary,
Unfortunately the current PilotAware software (Version 20180520) does not support the Raspberry Pi 3B+ Board, so if your new board is as you say the 3B+ version this solution won’t work.
We are testing on the 3B+, but still have some unresolved issues under investigation, so can’t say yet whether the next software version will include full support for the 3B+ (which would solve your problem) or not. Sorry!
In the meantime, it might be worth trying a bit of sticky tape to secure your card in your original board as a ‘temporary fix’. Very ‘low tech’, but worth a try.
Regards
Peter