Dont change anything on the neutrals whites and all the grounds should all go together. Obviously without any sort of specific specifcations i cannot give you a part number that will help you out.
2 Lights How To Wire A Light Switch
Combine two light switches into one. Then pigtail both of the two switched lines that return to the fixtures to the switch output side. Combining 2 switches into 1. Neutral is in a pigtail without connecting to any switch. Those two light switches are in the same switch box and the same circuit. All you need to do is hook one of the hot lines to the switch and cap the other hot line with a wirenut. They are connected to their own loadlineground wires.
If not your gonna need a bigger switch. However if you do not wish to splice the two wires together there is an alternative. You need to make sure that the two fixtures added together are somewhat lower than the switch rating. Electrical lighting i have a 3 gang box and im interested in combining 2 of the existing single pole light switches in the box into 1 switch that controls. Now with one single device you can switch two items. Now just pass the two switch legs through this switch.
When you remove the tab on the line side of this switch it will now handle two completely separate and isolated switching functions. Leviton as well as many other companies make a switch that has two single pole switches built into one switch.