no. luohan 18 hands has evolved over time. how much? we don't know.
luohan 18 hands has been extensively reviewed in the Ming dynasty. they increased it into 18 forms. however, in the latter half of the Qing dynasty, Shaolin monks did a great attempt to purify Shaolin syllabus by cherry picking the bests and throwing away redundancy off the Shaolin system. out of several hundreds of barehand forms, they picked a hundred, and then just 18. this is when most those luohan 18 hands forms couldn't survive. Encyclopedia lists 8, but just one or a couple survived in the temple. we don't know what exactly they did, they just give us these as Shaolin luohan 18 hands.
Deyang's is the 1st form of the Encyclopedia, and this is the 8th form, the same that is usually done by Dejian, Shi Yan Ao and others. this is actually a bigger frame of the 1st form. like a small & big pair.and whats the relation with this form: https://www.youtube.com/watch?v=HAdRmBS4C-A ?