Cat c13 ecm replace issue

Hello guys

my cat c13 KCB 2007 ecm got bad. I ended up replacing it with same series engine ecm from Kenworth (same year as mine Kenworth)

I didn’t get it reprogramed , my engine now goes at 65mph at 1300 rpm before it goes at 1400 rpm.

my question is should i reprogram it from cat or leave it as it is , i have no other issues, everuthing is working.

only thing i feel is less rpm makes it little hard to pull hills.

thanks

 

Cat is asking $400 to reprogram whole ecm to my vin. I am curious like if i leave it like as it now (low rpms) is that any problem to engine or any other issues?