Zerberus problem

Hello.
I successfully use in my scores Zerberus .sfz library of wav samples. Now I’ve got a problem because I need to add in score additional staff with same tones (notes). Now the first staff sounds well with my wav samples, but second one sounds with default sounds. Is there a way to solve this problem of duplivate notes and how?
As example you can listen original score here - https://youtu.be/U9flpuLxfMU
Now I need to add there additional staff.

Here is description of three notes in question:
<region>
sample=samples\s1.wav
lokey=38 hikey=38
pitch_keycenter=38
volume=11
offset=0
end=959519

<region>
sample=samples\s2.wav
lokey=41 hikey=41
pitch_keycenter=41
volume=11
offset=0
end=959519

<region>
sample=samples\s3.wav
lokey=45 hikey=45
pitch_keycenter=45
volume=11
offset=0
end=959519