Actually, yes, IF!! you also swap the fuel pump and the wiring to said pump.
Yes, there was a weather change for 1991; it got the same pump as the 1992+ Magnums did.
While changing, if you can find a 22 gallon, I'd upgrade since you'll be doing so much work anyway.
I've attached the parts list for 1990-1993 so you can see the part number changes in the tank' also the list of fuel pump assembly part numbers (alas, the 1990 fuel pump assembly has been NLA for quite some time!)
I have neither 1990 nor 1991 wiring diagrams, but I DO have 1988 and 1992; the 1990 should be the same (FPA was the same part number) and 1992 wiring there should be the same, if you're going to go for this.