One looks just like a Khaki Campbell, the other like a WH cross, or a Khaki Campbell cross. I hate to disappoint, but at this stage they don't have the right color for a Welsh Harlequin - they should be mostly white with some markings, not mostly or all brown.
Here we have a trio of Khaki Campbells in front and a pair of Welsh Harlequins in the back, you can see the difference:
Here we have a trio of Khaki Campbells in front and a pair of Welsh Harlequins in the back, you can see the difference: