I think the screws are different lengths. The same thread pattern, same as a 1911 by the way. They had mentioned adding allen head screws but I'm not sure they have done that yet. I wasn't aware they had any choice in wood. I thought they were all Pau Faro. Like most wood theres alot of variation in it so they can look really good.
In your case a phone call might be the ticket or perhaps an email would work too. Make sure they send you the appropriate length screws for the wood. I think they are a little longer than the polymer grips.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."