There is no interchange.
We used to have Rexroth make us an FDC brand replacement for the original KYB unit. However they will no longer produce it for us.
We get this inquiry daily and we are still working on finding a solution.
We do currently have something to offer, but it requires us to supply a new sprocket that is our own make. In North America our customers do not like this solution. Performance is the nearly identical to the original CAT unit. It is a good solution and the cost is around $7,000
We used to sell over 100 of our FDC brand replacements a year, with the above mentioned solution we sell maybe 8.
I recently visited one of our factories and we have tentatively agreed on a mass produced FDC brand drive that will be an excellent solution to the problem.
We hope to be able to offer this unit by July.