Microchip brand identity is a valuable asset protected by trademark law. Microchip aims to protect this asset by ensuring that its trademarks are used properly by Microchip, its customers, licensees, distributors, vendors, consultants, developers and others. You may use Microchip trademarks and product names to refer to Microchip products and services as long as you follow these Guidelines.
...
Re: Reusing PGC & PGD pins
Yes you can reuse them but you need to be careful as to what circuitry you hang off the pins.
tumbleweed Today, 13:29Most ICSP programmers have 4.7K pull-down resistors on the PGC/PGD pins and assume the pins will idle...