Early Mycenaean gold cushion seal.

leading from

Minoan seal stones and rings

An early Mycenaean gold cushion seal from Shaft Grave III, 

Grave Circle A, Mycenae, showing a duel between a sword-bearing and a spear-bearing warrior. CMS I 11,
 
(from a grave dating back to 16th BCE)

The question about how it might relate to the Henu Barque goes on.

But it's as if the two kestrel heads and the upper kestrel's collar have combined to become the right figure's helmet

The boat with the piles of sand looks as if it's tipped onto its left, but luckily for them the sand isn't falling off otherwise they would be in a mess.

The oryx's head and horns becomes the left warrior's sword arm and sword, while the beaded rope and bulls horns becomes the centre of the left warrior's chest and up to the bottom of the head.

Illustration based on a reverse impression from the combat cushion seal

 

The crouching man's head becomes the left warrior's buttocks and his body becomes the lefts, slanting forwards

The fan of the barque becomes the tube coming out of the back of the left warrior

However there are other ways to interpret connections between parts of the two.

c)  The Henu Barque from The Papyrus of Ani (source British Museum)

Comparison image of the Henu Barque from Papyrus of Ani
(source: The Papyrus of Ani at the British Museum)