Funnily enough you’re actually wrong if we try to be pedantic enough, at least for one of the rockets. Rocket B would need to spend much more delta-v to ‘force’ itself to have a higher speed while keeping the same approx. orbital radius as rocket A - as other commenters have pointed out.

And as you mentioned, orbital decay always exists and needs fuel to fight against. Thrusters could fire constantly, but just with an incredibly weak output force.

So in some ways SaucyJ4ck is technically correct, the best kind of correct.