Smaller diameter reguires shorter port, so if you keep the length same you will be tuning it tad lower than designed. If it doesn't sound right, you can cut of 5-10mm and try again. Most likely difference isn't more than few hertz.
I don't think that there will be any problems with wind noise in port because of that missing 5mm.
IF you want to play safe, use 100mm tube and make it longer. How much, can't say directly. Perhaps you can use Winisd to check that?