Generally, I would say a 1000 should be worth more than an 840. However, we should consider the individual aircraft.
The 840 has brand new avionics, new paint and interior, and low time engines-- and is coming from a very reputable seller.
The 1000 is a 695B, which is really good, but still has most of the original avionics, higher time engines, looks somewhat tired... I won't say anything about the seller, as I haven't had any personal interactions with him.