JPX 919 Combo Set Loft/Lie/Length Adjustments

[dejanomics]

I was fitted last year for the Mizuno JPX 919 Forged 5-GW with standard lofts, but 2* upright for lie angle. I am looking to add a club in the 4 iron slot and naturally was thinking the JPX 919 Hot Metal Pro or regular HM. My question is, do I need to make any adjustments to the loft/length of the HM Pro 4 iron to blend with the forged set or do I just leave it as is? I have been going through many forums and I cannot seem to get a straight answer. Some say adjust the lofts by 2* to blen with the forged set and others have said leave the lofts as is. Any help is greatly appreciated.