Replacement hose nipples are not that much, $5-10 in most cases.
If the old one has deep rust pits where the hose fits, I'd say why risk having the hose leak for such a small price.
I know you bought a reman pump, but new aren't that much more. Most times, a new pump will come with the fitting(s) needed to install it.
Locktite on the fan clutch? No need, if you get it tight. Particularly if you ever want to get it back off.......