MC1454 vs CD4541 timer IC

When repairing som PCB's at work I came across the MC14541B timer IC for the first time. It's fitted on a board from early 2000's, I guess.

From what I can see from the data sheet it's pretty much identical to the well know CD4145 IC. Pin campatible, both CMOS and about the same supply. I can't see the difference. Ironically, 4541 backwards is 1454.

Does anyone know something about these? Think I'll use CD4541 in repairs, since they still available, though they are listed as obsolete, at least the DIP version.
 
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