Confusing puppy names.?

A while ago we contacted a greyhound breeder and reserved a greyhound, when we did so we decided on the name Lyndsey, and she is to be delivered to us on wednsday. The problem comes in when my sister got an 8 week old Coton puppy on sunday and named it Lilly. It is not too late to change Lilly's name but my... show more A while ago we contacted a greyhound breeder and reserved a greyhound, when we did so we decided on the name Lyndsey, and she is to be delivered to us on wednsday.
The problem comes in when my sister got an 8 week old Coton puppy on sunday and named it Lilly. It is not too late to change Lilly's name but my sister is EXTREMELY resistant to changing it. However the breeder has been calling Lyndsey, Lyndsey for quite some time now, around 4 weeks.

Will these 2 names be too confusing?

Will Lilly (Lill-ee come when I call Lyndsey (Linz-ee)?
I really hope not.
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