Thanks for the replies.
sj- I saw and downloaded the manual but noticed the MDTK says "RF Frequency: 318 MHz" but the new operator mentions "315 or the 390 MHz frequency". So, I don't know if I tried to "pair" the old keypad with the new operator if maybe it would wipe out the remote codes and the Homelink on my wife's van. Basically I don't want to screw something up.
I was just hoping for confirmation from someone who has some experience to set me straight.