First one looks western-made to me.
Might find the mark here:
americanbonsaiceramics.com
'
Or here:
Potter Stamp / Markings DATABASE for European BONSAI POTTERY.
www.europeanbonsaipottercollective.com
The second is likely Chinese, but I don't know the stamp. Don't know if you're on Facebook, but there is a group there that has a few top experts on bonsai pottery as members.
Log into Facebook to start sharing and connecting with your friends, family, and people you know.
www.facebook.com