I tend to like/prefer the apprentice plug more than the "elite" level plug... I like the simplicity of the design and yet the aesthetic design it has. So I wouldn't call it "boring" personally... it also fits INSIDE the emitter, which is a plus. And it's also used on the Sorc, as with 6 claws it can be a pain to get the lipped elite plug in and out.
That aside, yes there are two types of blade plugs, depending on which hilt you ordered, you will get one or the other. The elite plugs do not work on the acolyte/disciple at all because of the slanted emitters; if you purchased one of those, it's a waste to buy an elite blade plug to put in them, as they won't fit. But you can purchase extra blade plugs on the site or through etsy if you have need of more of them... that's why they're listed. For spares/etc. They're the same models as what come included with your hilt purchase.
Hope this extra clarification helps.