V5R1M0/V5R3M0 Mixed Environment

[EDoxtator <doc6502@xxxxxxxxx>]

All

I'm working on a project right now that has the following configuration:

Development system:  V5R1M0
Test system:  V5R3M0
Production system:  V5R1M0

We're developing OPM code using Synon (sigh)-- everything is compiled on the
development system and deployed to either the test or production systems from
the development system.

I'm not worried about promotions to production, that's V5R1 -> V5R1.  However,
I am a little concerned that we're jumping a release when promoting to test. 
Are there any V5R1 -> V5R3 incompatabilities in either OPM RPG or OPM CL that
may impact the runtime and cause different test results?

(BTW, there are no plans to upgrade the development or production machines to
V5R3 anytime soon.  Nor will the subject be broached, lest ye die.)

Thanks

-Doc