Yes but read on, they are build differently. All the 1XXX models are 10kg + monsters. The way they do the models seems to be developing a top model and then make 2 cheaper versions of that model using the same DAC. But often they use different versions of the DAC, like I mentioned all the X93 models use YAC514 but the top model uses the YAC514F a revision of the DAC. Follow this link; you will see a clear pattern:
http://www.freeweb.hu/mestertuning/dac.php?lang=en
That was only the DAC, as you know the DAC is only a small part of the sound. There are also the up amps, power supply and all that stuff.
The first thing that leaves the CD-P is the optical link, which will often be the main difference between an 8XX model and the next model. They properly also downgrade many of the more expensive components, you need to do a comparison of the SM's to know what they did but they do use the same PBC.
The 1XXX + models are special; there was no "low end" models made from these designs. The did as they usually do, 3 model per design CDX-1100, 900 and 700, they did that from 1988 - 1992 those was Yamahas thru high end years in CD-P's. But they had a problem they needed something for the "low end" market, so they did what you suggested took an older design, downgraded properly everything and sold it. That happened with the XX00, 10, 20 series; the biggest lineup Yamaha ever did 6 "new" models in every year. But then it stooped, the XX30 and XX50 series only had 4 models. The last 1XXX series (60, 1992) came in 5 models, covering from low to high end. That was the last of the big Yamahas, they changed there focus to multi channel setups I thought. In 1993 they released the X70 series (that might be a down grade of the XX60 series), then in 1994 came the X80, in 1996 the X90. Then in 1998 suddenly there was a new 10kg machine the CDX-993 (remember the last one was in 1992, 6 years!) And a full line of CD-P's from high to "low" end. I don't know what happened at Yamaha, but somebody must have been beating the drum quite a while to make a new high end player, they newer did one again. But a strange thing is that it was possible to buy new 993's all the way up to recently, I don't know when Yamaha officially stopped making them, what I do know is that I see people telling that they bought there new 993 in the shop in bought 2004 and 2005. There really is something strange about the design; I believe the current design (X97) still is the old 993 design.
The only reasonable reason for this must be that Yamaha thinks that the sound produced from a 44.1 kHz 16 bit source, does not get any better than the design made in 1998.
Yes Unda, there is more added metal inside the 993, but not as much as the 1060
Note. The reason that I always write "low" end is that Yamaha always was best in class; they never made crappy CD-P's
