There is no technical difference.
The designation Bp is an older designation. Bp stands for battery powered, which is no longer mentioned in the "new" designation.
But they are the same products.
So it's better to take the cheaper offer :-)
The appliance does not require a hoover bag, it works bagless with a 5-litre collection container. The escaping air is cleaned via an exhaust air filter, a hoover bag is not required and is not supplied.
We work with daily prices, which can be influenced by various factors such as purchasing conditions, stock levels and supply and demand. Unfortunately, we have no information about when and if the price of this item will be reduced.
Basically the same device, the linked ones are simply the ones with a newer production date. The manufacturer now only sells it under the number 1.394-277.0.
However, the technical features are the same.
The appliance does not require a classic hoover bag, but collects the dirt directly in the 5-litre container. You can optionally use fleece filter bags (dust class M) to optimise the suction power and keep the container clean.