multiple keyless entry remotes

i had a
1997 Pontica Boneville SSEi 40th anniv
and a 2004 buick lesabre custom.
each has a keyless entry remote and i wonder if i can get one remote
to work with both cars. i know aftermarket remotes can do this
the remote p/n's:
1997-> GM/UTA 25678792 FCC ID KOBUT1BT Canada 1983 101 393
2004-> GM/UTA 25695954 FCC ID KOBLEAR1XT Canada 3521 1021718
tia, peter
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