Did you swap the sound and speech boards into Steve's Gorgar as a set?

It looks to me like DS1 switches on the sound board are backwards. Switch 2 is on the top and should be ON and to the LEFT, Switch 1 is on the bottom and should be OFF and to the RIGHT.

It also looks like somebody may have removed the W1 jumper (between 10J3 and R11) recently as it is only used in games without the speech board. No jumper is correct for what you want, it just means this is probably not the original sound board

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Unless its an optical illusion in the photo those dip switches are not set correctly for speech.

Maybe they were accidentally moved after it was tested in the other game? Will only take 2 mins to double check, based on coloration it even looks like switch 2 spent most of its life in the other position.