I just installed in localhost, it is giving same feed output for both urls(gallery, album).
http://192.168.1.222:82/galz/index.php?rss&albumtitle=xxx&albumname=abc%2Fxxx&lang=en_US

http://192.168.1.222:82/galz/index.php?rss&lang=en_US

My System settings:
ZenPhoto 1.4
Windows XP
Apache 2.2
PHP 5.3
MySql 5.1

I will take a look if I can reproduce it.

I forgot to specify the plugin, I'm using Static HTML Cache.

It can reproduce it. There is a bug in the rss caching. Fix for now is to disable the rss cache on the options.

Yes, without cache it is working fine. thanks @acrylian