Welsh Harlequin or Silver Appleyard?

[HenzandHoundzFarm]

So I recently got a duck advertized as a welsh harlequin drake , but he's a lot bigger than the female I have. When I looked it up it, it seems that the drakes for WH and SA look exactly alike?! How can you tell them apart? I can post pictures of mine later but I just want to learn the breed differences

 

[Timothy Menezes]

How did this thread not get a single helping hand. Wow. Ok well first off just weigh this guy. Welsh's are light, lets say 6 pounds off hand, and SA are much heavier. Dunno how much but it's a huge difference. I assume about 9 pounds or so.

 

[JJchiknshak]

Wish I knew. I have a duckling now that I can't tell what it is.