Converting viscoelastic Prony Series terms from ABAQUS to LS-DYNA

In Abaqus, 

g(t) = 1 - ∑(g_i * (1-exp(-t/tau_i)); 

in which g and g_i are dimensionless. 

In LS-DYNA, 

G(t) = ∑( G_i * exp(-beta_i * t) ); 

in which G and G_i are in N/m²

Based on this information, how do we transform the Prony Series terms from one code to another or vice-versa given I don't have the test data available.

Also, if I have the test data, what is a recommended process to determine Prony Series terms from the same?