Once gas leaves the end of the valves gas is gas. So the shutters do not change nor do the burners between NG and LP. I have done MANY of these conversions for myself and other folks and have never once touched the shutters or even saw a need to.
If you're buying an entire manifold for your 410SE it should be a simple bolt in exchange. You should have no issues at all. No adjustment needed of any kind. Remove LP manifold, replace with NG model, hook up correct hose (one thing I don't know here is if the NG models of this grill came with a regulator) which can throw off the conversion. I remember when I gave my grill to son in law it had been set up to run with a regulator (I did this on purpose) but when it was hooked up at his house I forgot this as I had been using it on LP for quite a while since I had my Summit and my Wolf on the deck I was using the Genesis on LP as the garage queen. So when I brought it to him I slapped on the NG manifold I had set up and hooked it up. Wasn't until he told be it really seemed HOT I remembered it was on full NG pressure (7.5" WC) and I had set that manifold up for 4" WC. So I quickly made a set of orifices for 7" WC and all is well for him now.
So Ted, if you're buying a full NG manifold you need to look VERY carefully at a NG model and determine if Weber designed it to be used with or without a regulator. Silly them there is no consistency. So be sure