Yes, same type. I.E. SS1K, BB, BBG, etc. They would like you to do all SS1Ks of any version or all BB1500s of any version, etc.
From
HERE "You must earn the same type of certified ride for each of the four astronomical events. The four rides need not occur on consecutive astronomical events, and your qualifying rides may span more than one year."
From the
Sharknose 1000 "The Sharknose 1000
is a SaddleSore 1000 motorcycle ride on a Harley-Davidson Road Glide." This ride is just another version of a SS1K. It just gets a cool cert. Still just another SS1K ride. So if you want to include your Sharknose 1000 in your four season ride submission, you need three other SS1K rides for the other equinox/solstice rides.