Every campaign has its own conversion tracking script, you can find it on the integration tab in your InviteBox control panel. So, normally you would need to paste 2 tracking scripts. If you want to run only one campaign but had to set the second one up only because you needed to use different images then this issue can be easily resolved. You need to change your current integration type to "custom". Then, insert the images on your side and execute the same widget script when people click on those images.