Is it possible to use the MK3 to use sounds from another device or keyboard and then play those sounds on the MK 3 without using a Daw, Kind regards
If you are referring to the S-Series MK3 keyboards then albeit that they are 'advanced' midi controllers then they are still only midi controllers and as far as I know then not capable of loading any sounds into the keyboard. So to make any sounds you will have to use some kind of midi compatible program to hold/store and to play the 'samples' in question. (A sampler or a synthesizer may be able to load samples and play them)
If you are referring to some other N.I. MK3 device then I do not have the sufficient knowledge yet to answer the question!
What synthesizers are capable using samples : https://gearspace.com/board/electronic-music-instruments-and-electronic-music-production/1341950-what-synthesizers-capable-using-samples.html
MPC ONE - How To Connect & Record External Hardware Synths : https://www.youtube.com/watch?v=_sekUZzY4qQ
Best soft synths to load your samples to : https://intimatenoise.com/best-synths-to-load-samples-to/
How to Turn Samples into Synths : https://www.youtube.com/watch?v=HyXvY_PXI9Q
Loading Your Own Samples in to a Sampler : https://www.youtube.com/watch?v=ms7cIWfsJkU
Understanding The Difference Between Samplers and Synths : https://www.youtube.com/watch?v=myYPVD8M6dI
P.S.
FORM (Manual here) , which is part of Komplete 14 Standard or better (see section SYNTHESIZERS) , is suggested as such a program to use to hold samples !