Hi Could Somebody help me, is it possible to play 4K Blu-Ray Discs on a Upscalled Blu-Ray (4K) Mode, these are different equipment, but wonder if it play, or do i have to buy the complete 4K Blu-Ray players to play them, Thank you for your help

Yes.

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I'm not entirely certain if the 4K disc is any different to a standard Blu-Ray disc. If it isn't then it should, in theory, play in any blu-ray player. If the discs are different then it'd be like shoving a blu-ray in an upscaling dvd player.