Would you buy a second pair of the same brand & style of walking boots online, without trying the second pair on?
Yes, they'll probably be pretty much identical to the pair you own
Nooo! They are from a different batch and may pinch cruelly!
Would you buy the same brand of walking boots, but a different style, online if they were much cheaper?
Yes, they'll probably fit if the first pair are OK, even if they are a slightly different style
Noooo what kind of boot-buying maniac are you? Always try shoes on first! You can't economise on feet!
And for the sake of completeness:the same brand & style of bootSame brand, different style
- but so cheap!