A B350 CREW; WHILE BEING MARSHALLED TO A PARKING SPOT AT JAC; MADE CONTACT WITH AN ADJACENT ACFT.

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WE LANDED AND TAXIED CLR OF THE ACTIVE RWY 18/36 IN JACKSON HOLE; WY. TWR INFORMED US TO MONITOR GND; AND TAXI TO THE RAMP. AS WE PROCEEDED TOWARDS THE FBO I SPOTTED 2 RAMPERS WAVING THEIR ARMS AND MOTIONING ME TO COME TO THEM. I STOPPED THE ACFT BRIEFLY AND COMMENTED TO MY FO. THE PARKING SPOT LOOKED TIGHT. IT WAS QUESTIONABLE; YET BOTH MARSHALLERS AHEAD OF ME WERE GIVING ME THE FORWARD AND ALL-CLR THUMBS UPS SIGNAL. I BEGAN ROLLING FORWARD SLOWLY ALIGNING MYSELF WITH THE CTR OF THE DISTANCE BTWN THE NOSE OF A B757 ON THE L; AND THE TAIL OF A WESTWIND ON THE R. AS I APCHED CLOSER TO THE L ACFT I STOPPED AGAIN; TOLD MY FO; THIS WOULD BE CLOSE AND ASKED HIM HOW WE LOOKED ON THE R. MY FO INFORMED ME IT WOULD BE CLOSE AND THAT BOTH MARSHALLERS (ONE AT 12 O'CLOCK POS; ONE AT 10 O'CLOCK POS) WERE GIVING US THE FORWARD AND THUMBS UP SIGN. I AGAIN STARTED TO ROLL SLOWLY AND GLANCED FORWARD AT THE MARSHALLERS; BOTH CONTINUED WITH THE FORWARD SIGNAL. AS THE L WING PASSED IN FRONT OF THE L ACFT; THE FO YELLED STOP. AS I IMMEDIATELY STOPPED; I ASKED WHAT HAPPENED. THE FO INFORMED ME WE JUST HIT THE R WING. I SECURED THE ACFT AND SHUT DOWN BOTH ENGS. WE EXITED THE ACFT AS THE LCL DEPUTY SHERIFF AND FBO MECHS WERE APCHING. THE MARSHALLERS WENT INSIDE THE FBO. THE R WINGLET WAS UNDER THE HORIZ STABILIZER OF THE WESTWIND A FORWARD DISTANCE OF APPROX 10 INCHES. DAMAGE TO THE WESTWIND WAS MINOR; NO SKIN PUNCTURE WAS CONFIRMED ONCE THE ACFT WERE SEPARATED. DAMAGE TO THE KING AIR 350 WAS MINIMAL; SCRATCHING THE TOP SURFACE OF THE WINGLET. CONTRIBUTING FACTORS WERE THE TIGHT TAXI AREA; MY DECISION TO TRUST THE MARSHALLERS; AND THE SNOW COVERED RAMP. IT WAS APPARENT THE ACFT SLID FORWARD A FEW INCHES UPON BRAKE APPLICATION. I LEARNED TO STICK WITH MY JUDGEMENT; NOT RAMPERS.