jfet datasheet
Only MOSFETs have regularly an electrical active bulk/substrate connection. 4-pin 2N4416, but the fourth "s" pin is clearly marked as case pin. 2N4420 has been manufactured by Valvo/Philips from the mid 70th, apparently as a second source for the original Siliconix type. A same type number, second source part will clearly have an identical sharing the chip masks or similar almost identical design. It's impossible, that the original part has 3 electrodes and the second source has four .
jfet datasheet
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