Generic question with a particular thrust.

Have just replaced our garage door (after 20 years near to the sea) and have been moved from 313? to 433 Hz frequency, which presumably means the old remotes are now throw aways.

I also had a couple of 433 Hz ones that never got used, but they have also declined to be connected to the new garage remote. I like to keep a second remote in the car in addition to the one on my keyring.

So I guess they are throw aways as well?