would this affect old migrations to Awards?

No, they use the constants explicitly, anticipating this change.

It will cause old award transactions to render "epriestley edited edges." or similar instead of "epriestley awarded this badge to chad.", but that's the only negative effect and I'm not planning to fix it since the app was beta when those awards happened.

(They also all happened more than a year ago.)

Or, at least, happened on a version of the codebase which is more than a year old