AFAIK, talk and standby time should be the same, dimensions and weight should be the same also. BT and CPU speed are the only things that differs. Some, though, reported that on 5830i with Ginger, video is still recorded @320x240 and not @640x480 (like on 5830 with Ginger).
PS: those talk and standby times could be based on diff Android versions (5830 with Froyo vs. 5830i with Ginger).