Quick question replacing eurocylinders

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I'm replacing my non snap resistant double cylinders with abs mk3s and I have a question about the length.

On my patio door the old locks I have are 40mm internal and 45mm external but they look way too long to me. On the external side there is an extra 15mm and internal 10mm.

Would I have any issues getting 30 internal 35 external instead?

The other lock is perfect with 5mm extra each side.

 

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ok so to get it flush on the external side would mean I should go for 30/30 for the patio and 40/40 for the other door I have

They are identical locks which I wouldn't be surprised have been in there since it was built in the 90s.

 

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Yeah I bottled it and went 35 because it looked like it would have been a mm or two short with 30.

I've just found my garage has a half euro cylinder which I can replace with a key alike lock. 3 keys down to 1

Shame I can't do that with the timber front door

Wish I'd seen your link earlier, would have saved myself £15 on one of the locks.

 

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but it's got 6 pins!!1