Countdown is a version of the "original floating minnow". Typically it sinks 1 foot per second and will vary between sizes.
The SK 1.5 is a squarebill. And the scatter rap is just a type of lip that can come on a shad rap, crank, original minnow and a few others.. even the tail dancer. So there are plenty of places to use it , and still fish the 1.5. I personally like the scatter rap shad. I caught 2 bass 4-5 lbs on it just this past season. But if the scatter rap disappeared I wouldn't be bothered. Because I've been using them long before and to me it is not really a game changer. They do work though.
I've had much success with rapala and it is my favorite company by far . I have more than 150 of their lures. Not ones I bought in bulk for cheap either. Rather ones I hand selected throughout the years.
My favorite all time (rapala) lures that I wouldn't ever leave the dock without are
1) shad rap and JOINTED shad rap. (Also get the shallow version of this)
2) fat rap and DT series. Don't slap the DTs on the water to clear the moss.. use your darn hand..
3) xrap shad ( shallow version of this as well ) gettin hard to find but I have plenty.
4) original floater . Slow retrieve , dead sticked , rip and pause , small twitches . This thing catches fish. Don't be afraid to get the big ones too.
I'll talk about these all day. If you want to hear what else I have to say about them. You can PM me. I might even have one or two for you to try out.