Hi and Welcome on the forum,
Not sure to understand your question, I feel a sort of language barrier in here. No problem, so let me guess.
Yes a code compiled in PBP 2.50 will also compile with PBP3, BUT if it's USB, you'll need to modify it to suit the next USB requirement since v2.60.
Reduced PBP3... this one I'm not sure of what you mean.. There's the full demo version which work for 30 days, this one no problem. But there's also The Gold and Experimenter version who have their limitations listed in the following link when you click on the Compare Edition tab.
http://store.melabs.com/cat/PBP.html
HTH
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