Does the cap of the Tempest fit into the slots on the top of the Reload Gen1?
I'm not certain what you're asking, but I'll give it a go.
By the slots on the top of the reload I am thinking that you are referring to the decapper that is on there to make it easy to remove a Vapcap cap. A vapcap cap is held on the tip by friction and catching the rim of it in the decapper allows you to pull the stem up to pull the cap off.
The Tempest head is the analogue of the tip and cap and it
screws on to the bowl which attaches to the stem just like the vapcap tip attaches to an 8mm vapcap stem.
The decapper on the reload captures the cap on a vapcap and allows you to pull it off the tip. (while hot)
The magnet on the reload holds the Tempest head still, so that you can twist the stem to unscrew it and expose the bowl. (while hot)
The decapper on the reload gen2 is deeper than the gen1, so that you can now pull off an armored cap from a vapcap. Interestingly, the slits for the VI in the tempest head happen to align with the decapper on the gen2, tho I can't imagine a use for that.
There's a great feature on the Gen 2 for if you happen to tighten the bowl a little too tight while the head is hot and the magnet isn't strong enough to unscrew it. On the underside of the top is an indentation that fits the shape of the top of the head so you can easily untighten it.
There is a lot in the Reload that isn't always obious.