Alright, so I'm not sure where the grey muzzle is coming into play on these. I found all three patterns and none of them have a grey muzzle on them.

https://horseeden.com/horse.php?id=43786943 - This is the sabino and it is an OG sabino

https://horseeden.com/horse.php?id=43734660 - Splash

https://horseeden.com/horse.php?id=43732992 - Tobiano

Maybe its possible for a marking not a pattern?

EDIT: And I had a thought and looked at this mare's filly. She has the same grey muzzle.

https://horseeden.com/horse.php?id=44400872

She also is a gold champagne tobiano sabino splash white, but with different patterns. I did double check the gold champagne even though patterns are on top of that, but that does not have a black muzzle.

My thoughts are it is either on a marking, not a pattern. Or possible on the mane and tail layer.

Edit x 2: https://horseeden.com/horse.php?id=44286285 This one has no patterns, but it looks like it is going over top of the face marking.

https://horseeden.com/horse.php?id=43825879 Here is another one just splash, I'm pretty sure it is attached to the mane layer.

Edit x 2: https://horseeden.com/horse.php?id=44286285 This one has no patterns, but it looks like it is going over top of the face marking.

I do think that it is much more likely to be attached to the mane layer, but Eve would be able to confirm. All horses will 100% have that layer. I feel like it is a strech that all three of those horses has the same exact face marking.

Also that one face marking was only the one I posted because there was the most visible white, and I hadn't thought of the mane quite yet.

https://horseeden.com/horse.php?id=38881532 - different face marking, you can see the grey over the sooty really well.

https://horseeden.com/horse.php?id=39612592

https://horseeden.com/horse.php?id=39711338

https://horseeden.com/horse.php?id=39754127

And those last 3 all don't have any pink on their nose but they do have different markings. But this is all just my theory until Eve can look into it