There is a difference, however your situation does not fit the criteria of a permitted 'stop'.
Double yellow lines mean no waiting at any time, unless there are signs
that specifically indicate seasonal restrictions. The words parked or waiting refer to the same thing and are used interchangeably in parking laws and regulations. Parking bans do not prevent loading and unloading of commercial deliveries or the transfer of bulky or large items between a parked vehicle and a nearby premises/pavement or vice versa. Loading/unloading can take place from double yellow lines, provided they are not subject to live loading bans (kerb chevrons marked on the kerb alongside the yellow lines).
Stopping is permitted on yellow lines, even when they are subject to loading bans, provided it is due to an emergency, to comply with a police directive/traffic signal or to set down/pick up passengers who must be on the adjoining pavement at the time of stopping.
Thus, a vehicle not loading/unloading (where permitted) but having made an unforced 'stop' for any length of time without setting down/picking up passengers is waiting, or parked.