Schedule Sync Rollup 9.0 with Core Server 9.5

I have an environment with two core server, one 9.0SP3 and another one with 9.5, the issue is that when I used the schedule task to make a rollup sync, the Core Server 9.0 SP3 works, but the Core Server 9.5 no works the schedule stay with working status and no concludes the task.

I would like know it is an issue or if is incompatiblity between versions?

Thanks

Alexandre