They do. There was the 'original 155gn Sierra MatchKing 'Palma', aka model # 2155, for a very long time. Decent enough bullet, but had the BC of a whiffle-ball and the general tug-boat shape (short-n-stubby) like the S168MK. Didn't have the f'd up boat-tail angle of the 168, though. IIRC (this part is before my time) the bullet was brought out for the 1992 World LR championships for the US Palma team, as that was (I believe) the first time where the competing countries were able to use their own ammo at international events - previously everybody shot ammo provided by the host country.
Eventually, when Berger moved up from a small boutique bullet maker to something more serious, and first got Litz involved (way back when, before anyone had ever heard of him) they (Berger) came out with a 155.5gn 'Fullbore' bullet. Couldn't call it 'Palma', because Sierra had the trademark on that name locked up tight. But the 155.5 aka 'Triple Nickel' had a *very* long and sleek nose cone, and a *very* short bearing surface. Very successful bullet, right out of the gate. The US FTR rifle team used them pretty successfully at the 2009 F-Class World Championship in England, and the 2011 Creedmoor Cup in Ireland.
Why is that relevant? Because eventually even the sling shooters started realizing that using the good ol' Sierra 2155 was like leaving points on the table, given the difference in BC. After some pressure from the US Palma rifle team, Sierra rolled out the 2156 design - which looked *very* much like the B155.5BT, with the addition of being factory pointed. They didn't completely get rid of the 2155 - it was still a good, if dated, design and met a lot of people's needs. But the crown jewel 'Palma' designation got rolled to the 2156 instead. If you ever see either of these listed with the 'C' designation, that's just the bulk pack i.e. 500 count box vs. 100.
The S169MK looks like (haven't had any in hand yet) someone went back and updated the S168MK to the standards of the 2156 design. In my opinion.
Probably more than you wanted to know, but there you have it.