Yes the back plate is a direct drop in but please don't harvest one from an AV Famicom to a use in a top loader
. The AV Famicom costs a bit more then they do and are a better system IMO. I had a few people ask me to remove the back plate/connector from an AV Famicom (working ones at that) to use on a US top loader. I refused to do it on the grounds that it defiles the AV Famicom. If you just need the connector though there are tons of dead SNES PCB's out there from which the ports can be harvested from, you would just need to find a solution for the back plate and mounting the connector. AV Famicoms keep going up in price and although you can still find them on eBay there are not nearly as many of them around as there were 3-4 years ago. When people ask me to swap an AV Famicom back plate and av port into the top loader I simply recommend they use the AV Famicom with a converter if they HAVE to have an SNES style av port.