Both are heavier than the RRS by a good measure.
Spec wise, and this is just the legs, not including attachments
364C - 5.7 LBS
404C - 7.5 LBS
RRS 33 Series - 4.3 LBS
RRS 23 Series - 3.3 LBS
RRS 24 Series - 3.3 LBS
In your hand, it's quite noticeable, I have the 364C here, as well as Most of the RRS models (one note I am not using the L models)
Final Comparison
Hog Saddle
PRST - 4.1 LBS - CF
0311 - 5.6 LBS - AL
The 364C is a big tripod unless you are over 6FT tall it's a bit overkill the LS-324C appears to be the correct model for shooting. It's 3.1 LBS with a 33LBS weight rating. They have some solid lightweight smaller models vs going with the big heavy 75mm ball versions, just use the lighter ones with a standard ball head.
Now having both the 364C and 324C in hand, I think I can better comment in regards to this.
I'll make a separate post soon covering these tripods, but for right now, with this thread, I'll give a quick impressions...
I'm 6'3", and IMO, the 364C has more height capacity than needed. It's not a small tripod by any means. But it's pretty stiff at full extension still.
The 324C, my impressions are pretty good, so long as you don't need to use the bottom leg extensions. There seems to be a decent bit of flex available in that last, narrow leg section. I think for most guys and most instances, this tripod would be sufficient. However, if you're a bit on the taller side, say, prob 6' plus... MAYBE even 5'10" and up, and foresee yourself using it extensively for full-standing positions, where you'd need to utilize those last, thin leg sections, I wouldn't get this tripod for use as the primary rifle support. But again, if you think about the people who will need to regularly use a tripod in full standing position, AND, are on the taller side... that's a fairly small group of people.
Side note on the 324C- IMO, this makes a sweet spotter tripod. It's PLENTY solid enough at full extension to support a standard spotting scope, it's pretty light weight, and relatively compact for the max height, considering it doesn't have a center post.
As I said, I'll do a full review on both tripods soon. I actually haven't gotten the 404C sent back yet, so I might just go ahead, open that up, so I can do a full review on all three tripods.