[Mik0mix]

I saw on another website someone said that they'd received their items , but one of them was the wrong item. Is this a likely outcome or no good?

The wrong Item received Is a universal method that's compatible with almost every company that has an Inventory of stock, so yes, It can certainly be used with your SE.

Now to try and work out something similar in weight that amazon stocks for relatively cheap, I see it weighs about 3lb 10oz

No doubt they'll ask me to ship the 'wrong' product back