This is another version of the same question about receivers - do you have to be 6'4" to be line-up at 'Z'?
There is a always a physical prototype for a given position - if a player doesn't meet that prototype, that leaves three questions: How much does the prototype matter, how much does the player deviate, and how well has the player proven he overcomes the difference?
The bottom line in a this case is that Skoronski will be going against DEs that on average are bigger than the ones he faced at NW, so having less reach gives a additional level of uncertainty in his projection. So if you are interested you look at every snap he's played, hope there are enough against NFL grade opposition to evaluate and then decide for yourself if you think he projects, but you are still faced with a higher level of uncertainly than you would have had if he fit the prototype for successful OTs better. But it's exactly those 'out of the box' kind of decisions that good FOs gets right and bad ones get wrong.