I have what may be a dumb question but will ask anyway.

I was looking on rockauto for Delphi TB sensors, specifically the iac for my 99 but only offered the standard and airtec and couple other economy brands etc. So looked at the 2000 model and there they have the Delphi as well as a Mopar OE iac along with the same other brands and part numbers offered in the 99 page.

Question is, is there any reason why the 2000 delphi iac won't work in the 99 and earlier models? Is the plunger, electrical plug or the blades different?