multiple keyless entry remotes

hi,

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