Should I swap my kids' bedrooms?

[oreo2020]

In a 3 bed house with 2 boys aged 14 and 11.

They shared a double bedroom until our aupair moved out of single bedroom. Then the my older moved into the single room and the younger stayed in the double room as this had toys and all the childish stuff.

Now the 14yo is asking to swap the rooms.

Pros and cons:
The 14yo is very tidy and organised and so fits into smaller space better.
The 11yo is incredibly messy (constantly nagging him).
Sometimes I feel like rewarding the 14yo for being tidy with a bigger room.
On the other hand, 14yo is likely to leave home for university sooner.
The 11yo is happier to share (for example, I keep some of common stuff in his room, and he doesn't mind an occasional relative sleepover).
The 11yo doesn't mind swapping but I don't think he grasped the concept of having a bigger space yet (I think he would realise once swapped and will regret).

What should I do?

"And then to have a pop at her for making the point that her lifestyle wouldn't suit a single room because of her partner, and accuse her of being a bit sad, is just ludicrous."

Eh? Is there a post I've missed?

No one has done this, why would you say they have?

Route I've taken is that they share the big room to sleep in (and store clothes), and the small room is a 'games room' with the consoles (double win - means they're not in the living room yelling), boxes of lego etc.

The only way I'd give up my big bedroom is if they gave up the living room - so I would have a little room to sleep in, and then basically sole use of the lounge. I don't think it would work in OP's case though.