About Frimwared M1306B

I have two fastrack M1306b,

M1306B WM16919
641b09gg.Q2406B 1339080 041604 16:04

M1306B WM17825
650a09gg.Q2406B 1949844 122204 14:53

The first one is ok, but the second one does not work correctly with my application.
can I recover the firmawared of one of the modems to guard it in other one? How?
Which is the difference between modems both?