Speedy's Spring Bars for Seamaster 2264.50?

Forgive the rather mundane question, but I can't find this information elsewhere.

Are the spring bars for the Speedmaster Pro and the Seamaster 300 2264.50 interchangeable?
I have both a Speedmaster Pro and a Seamaster 300 2264.50. When I have the Seamaster on a strap I have been using the extra set of Speedmaster spring bars made for using the Speedy on s strap (Part # 068ST2208). They seem to do the job well, but I read somewhere that the holes on the Seamaster may be a different size and I certainly don't want the strap to fail at the wrong moment. That doesn't sound right but I thought I would ask. Any comments?

Thanks! Do you know of an online seller that provides these spring bars or good quality clones? I would like to have a couple of extras just in case.