Cross Compatibility of EGR Components? Options

[blickman]

Have a 94 ST Manual Transmission. Rebuilt 7A-FE engine. CEL pn and throwing code 071. EGR valve doesn't hold vacuum when I apply vacuum to see if engine stalls.

Looks like I need to replace the EGR valve and possibly EGR modulator. I'm wondering if either of these are cross compatible with other models? For some reason both of these are very expensive for this engine and cheaper for other engines.

For example, I've only been able to find used EGR valves for the automatic transmission, not the manual transmission. If I could use the one for the automatic, I can save a bunch of dough. Are these interchangeable even though they have different part numbers?

Likewise for the modulator. I've found aftermarket ones on Ebay very cheap for the GT 5S-FE engine. The ones listed for the ST 7A-FE engine are much more expensive. Anyone know if there's any difference between these or if they're interchangeable?

Thanks for any guidance on this.

[blickman]

Thanks for the response. Rock Auto gives 4 different part numbers for these parts, 1 each for the ST automatic and standard and 1 each for the GT automatic and standard. The most expensive one is for the ST manual, which, of course, is the model I have. The EGR modulator is more than twice as much for the ST manual as for the automatic. That's why I was hoping they might be cross compatible.