  We study and compare characteristics of sunspot group latitude distribution
in two catalogs: the extended Greenwich (1874--2014) and Schwabe ones
(1825--1867). We demonstrate that both datasets reveal similar links between
latitude and amplitude characteristics of the 11-year cycle: the latitude
dispersion correlates with the current activity and the mean latitude of
sunspots in the cycle's maximum is proportional to its amplitude, It agrees
with conclusions that we made in previous papers for the Greenwich catalog.
  We show that the latitude properties of sunspot distribution are much more
stable against loss of observational data than traditional amplitude indices of
activity. Therefore, the found links can be used for estimates of quality of
observations and independent normalizing of activity levels in a gappy
pre-Greenwich data. We demonstrate it using the Schwabe catalog as an example.
  In addition, we show that the first part of the Schwabe data probably
contains errors in determination of sunspot latitudes that lead to
overestimation of the sunspot latitude dispersions.
