Hi ,
as per my knowledge you could browse feature list from Train station
http://wwwin-irt.cisco.com/trainstation/jmp?&-p=pi22
and if you need diffs b/w these two version you could very well browse using diff (cc diff) tool with followings labels( just dig how to get source difference b/w 2 labels in clear case documents)
V154_3_M1 2014-10-21 14:35:22
V154_3_M0_1 2014-07-30 16:57:11
you could find labels from version string using following tool
http://wwwin-metrics.cisco.com/cgi-bin/scmdbq?item=&vob=/vob/ios&.submit=Submit+Query
Thanks,
-Shiv