is there any diffrence??

[#1]

is the size of the sony ericsson neo diffrent to the size of the neo v??

[Sam]

Here is a full comparison for you, and no there is no difference in size:

http://www.sonyericsson.com/cws/products/compare?cc=au&lc=en#p=1022974,914652

[#3]

so i can get a case even though it say sony ericsson xperia neo??

[Sam]

That should be fine, just check any reviews of the product as I have come across some cases where they interfere with the proximity sensor of buttons.