TOPIC:

Hi is it possible to install the ha-lizard on two servers which have different hardware?
If so anything I should be looking for?

If you are installing just HA-Lizard (high availability only) - then the answer is yes as long as xenserver allows you to join the hosts to a pool

If you are installing HA-Lizard + iSCSI-HA (2 node pool with local storage), then this is also yes as long as your storage partitions on both hosts are the same size AND xenserver allows you to join the servers to a pool

Thank you.
Is there a way to verify if two servers will be allowed to connect to the same pool? I have one and want to get another one.

This is outside of the scope of HA-Lizard.
You should check the Xenserver hardware compatibility guide and look at the rules for heterogeneous pools.