  We study the generalized diffusion-limited aggregates (DLA), with two seeds
placed at distance d lattice units and investigate the probability p(d) that
the patterns generated from those seeds get connected. In this model, one can
vary the parameter $\alpha$, and get a range of patterns from fractal-DLA to
compact one. For a fractal-DLA, p(d) decays rapidly with d, the decay is slower
for compact pattern in which case p(d)>>1 for all practical distances. We
demonstrate a similar phenomenon experimentally in viscous fingering and
electrochemical deposition with two injection points/cathodes.
