PCRA grounds change of information

More details to this question:
Imy fiance took a plea in PA for person not to posess firearm because of a felony conviction in MD. when researching I called MD and his case was never finalized 6 years ago. his case in MD is now before a judge there where there is a good possibility that a PBJ will be done. under MD law PBJ is not a conviction. would this have any affect on the plea in PA? could I file a PCRA based on that? THe lawyer we had during our PA case was under investigation and is now in prison himself. We had asked him numerous times to call MD and get that case information as we knew something was not right as he was told it was not a felony in MD. had I never called his case would still of never gone before a judge. I am hopeful for a good outcome but wondering if it wil have an effect here in PA. it’s a felony here in PA but according to MD lawyer it would be a PBJ there and therefor not an actual conviction.