Hi Hendrik,
I assume, that you want to install the gallery clone in the original SOBI. The normal cloning procedure creates only a gallery clone for a SOBI2 clone.
If you want to have a second instance of a gallery in the original SOBI2 you have to do some more and some other changes. Check the XML file and you will see.
E.g. this line: <query>INSERT IGNORE INTO `#__sobi2b_config` VALUES ('countInListing', '1', 'sobi_gallery_b', NULL);</query>
It inserts the config key "countInListing" into the config table of a SOBI2 clone "#__sobi2b_config"
If you change the line to <query>INSERT IGNORE INTO `#__sobi2_config` VALUES ('countInListing', '1', 'sobi_gallery_b', NULL);</query>
to use the original SOBI2 tables the key "countInListing" would be used for the original gallery and the cloned gallery. So you have to change the key name to "countInListing_b". But you have to do that not only in the XML file but also in the code where the key is used.
Trinity