totally different
If i'm correct at English (which i'm probably not),the Estonian language group is Finno-Ugric,which is present at Finland,Hungary and Estonia,and the Latvian language group is Baltic,which is only Latvian and Lithuanian.
And Estonian is totally different from Latvian,for example:
English - Food is really tasty
Latvian - Ēdiens ir ļoti garīgs
Estonian - Toit on väga maitsev
see how unique Latvians are?