CJK U+3ADA and U+66F6

[jameskass]

Is there a difference between U+66F6 and U+3ADA?

The newest UNIHAN.TXT file doesn't have a definition field for
U+66F6.  The glyphs in the Unicode 4.0 book appear identical
for these two characters.  One is placed with radical 72, the
other with radical 73, although UNIHAN.TXT gives both as
having radical 73.  

U+3ADA  kIRGKangXi      0502.080

U+66F6  kKangXi 0502.080

(In UTF-8:)
U+3ADA (㫚)
U+66F6 (曶)

Best regards,

James Kass