I wouldn't do it, a friend of mine owns the sz, it's not bad, but for me the EC is just the "better" one.
Really depends on what you like, the only reason for me would be, that I would like the SZ better.
In my opinion the SZ just sounds a bit "flat", the EC has more of a own voice.
Played both pretty often and like I said before, the only reason would be the feeling.
You're tuning very low, so the scale length could be another thing, but the difference isn't that huge.
Moneywise, the SZs aren't as popular as the ECs in my experience, so a nice EC could be sold
better used than the SZ used.
But have in mind that I am biased because your EC is almost my dream guitar
