Comparing data in 2 tables on different servers with CHECKSUM
We use mk-table-checksum. 

It works really great in Master-Slave context where it also allows to sync differences in both directions depending on your choice.

Saidly from what i've seen most people it for replication and i can't provide any copy/pasteable output but if you don't know it it's definitly worth looking into. If you know it i'd like to hear why it doesn't work for you.

To get an overview over many tables you can use something like mk-table-checksum host1 host2 | mk-checksum-filter