#652 is a paint cleaner/polish.
#601 is a polish bonding agent.
Two very different products.
#105 is the LSP in this group.
If you already own all three, I would use all three. The #652, followed by the #601 and finish with the #105.
Read and follow the instructions for all the products. #601 is not removed prior to applying the #105.
To confuse you even further.

I use #501 Marine & RV cleaner polish for my first application. It does a great job of cleaning and leaves some protection on the paint.
My process is: #501, #601, #105. The three products seem to work quite good together. The #601 may remove some of the protection left by the #501, but my main reason for using the #501 is for its exceptional cleaning abilities.
If you haven't placed your order yet, you might want to research #951 Aqua Wax and consider adding it to your order. A great refresher spray wax that is very easy to apply between your regular waxing sessions.