Is it rude to ask to change strap for a different brand?

[ragna93]

So, I was going to go to a Lange boutique to help me change my strap to a new one. Yet, since my Maurice Lacroix has the same lug size as my Lange, I was also wondering whether I could ask the boutique to swap the old Lange strap into the Maurice Lacroix one.

So, old Lange strap -> new Lange strap (both on a lange watxh)
Old lange strap -> swapped into Maurice Lacroix.

Is it considered rude to ask this? Just wondering..