I am not sure how similar the two are; the version used on the now defunct speaker linked to earlier by someone, used a mylar variant that was made in Japan. The distortion, while not ideal, never entered a level that would be audible on music program. Isolated sine waves are another issue. Frequency response of the version used, was not ideal either, and that has been fully disclosed by the person in that linked post. The 0 to 30 degree window of that tweeter, in the main part of the passband, would have a +/- 3dB variance, and it would exceed that, with narrow deep nulls starting to occur, at further angles, though the response over 7 or 8 kHz remained pretty close to the on axis response, with the main issue being, that the treble never actually reduced in level, even at 15khz more than a few dB, at extreme angles, which is the main feature that made the driver so well suited to that old application where I could not find a better omni type driver - at least not with practical access(I had tried to buy Gallo CDT tweeters for testing, but Gallo refused to sell them as parts). The Linaeum is not an easy driver to use - and I have not used it for a while - nor will I likely use it again.
I have ways to do an omnipolar-like response now including high frequency range includig 15kHz, with results keeping an extremely smooth response on and off axis at extreme angles. I have gone through several prototypes, and the final version is very close to being picked, and then built into proper finished units. But I would like to some day measure Gallo CDT tweeters - they might be a good solution. But in the past when I tried, Gallo would not sell me the CDT tweeters as parts. There are very few really good omni type solutions for high frequency drivers. Maybe MBL will sell the high frequency omni tweeter to me at a semi-reasonable cost.
-Chris