How to make exactly the same origional surface after isotrim surface

[nec.oking]

after isotrim surface cannot match 100%.gh (8.6 KB)

Hello everyone, (it’s my first post)
I’m new in Grasshopper, my question is just like my title, after set one surface > divide domain2>iso trim , the surface(a trimmed fillet surface) always changed to a bit also some other component… Is there any way I can divide surface and play around some pattern on the surface without changing?

Any help will be appreciated. Thank you in advance.

[Adam_M (Adam Mounsey)]

Maybe this could work for you, using Surface Split:

[nec.oking]

Hello Adam ,
Thank you so much for the idea! I will try.
Thanks again.