Epoxy Primer on etch primer

I've read and was told conflicting advice. Can I use epoxy primer on top of etching primer? I haven't done anything yet. I would assume not, but thought I would throw it out there. The epoxy primer I have is the CRE line of PPG's Commercial Paint.
 
The only reason for etch is on new metal that a body shop wants to use instead of sanding. If you sand, etch is redundant. On old metal that you have to sand anyway just use epoxy, etch will do you no good.
 

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