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I've done a number of cataract removals on TVs. RCA type cataracts look white and or black and moldy (as in both your pictures) Zenith turn yellow-green at the edges... I've seen RCA tubes with Zenith style glue and Zeniths with RCA style glue...I've also had Philcos that were somewhere in-between. The best process is different between the types.... Zenith uses soft glue which is best cut with guitar string at room temperature in shade (heat can help but isn't anl necessity).
RCA is either heat and clothes pins or water (never had luck with water). Sun is best, up in Wisconsin I often have to grab a heat gun as a helper (the glue needs to be around 160f to let go) if you use anything other than even direct sunlight have an IR thermometer on hand and scan all around the face (you want to avoid differential of 30f or more across the face or the face can crack says a voice of experience). You want to pry out some of the edge glue to give the clothes pins a place to go....be very careful doing this...If you crack the safety glass you're guaranteed to be chiseling off over half of it which is unpleasant and after doing it right 4 times over the years I recently was rushed while doing one and chipped the hell out of the CRT face by accident. I don't have a favorite glue removal tool everything I've tried either bends too much or is too brittle and ends off snapping off either on the first or third tube.
The one pictured in the TV is cataracted clean to center...The glue isn't holding it anymore, and if the tape isn't holding it either it'll probably fall off when you remove the tube from the set...at its most stubborn all you should have to do is cut the tape and lift it.
The tube out of the set that only has a little edge cataracting will be difficult and require heat and clothes pins.
Generally the worse a RCA cataract looks the easier it is to fix. The rectangular RCA tubes tend to be harder too... Granted that may be sampling bias. I've had at least one of almost every RCA roundy chassis, almost no RCA rectangulars.
Zenith style tubes are cake to do a cataract removal on as long as your stand doesn't tip over when the string snaps...
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