You can calculate the min and max value of A and B together and set the CLim of both axes to those values using the clim (formerly known as caxis) function.
A=[14,8,3,5,6,5,3,3;16,2,7,-7,3,1,1,4;3,1,1,1,1,0,0,0;3,1,2,1,1,0,0,0];
B=[5,4,3,3,1,0,0,0;33,0,5,8,5,4,3,5;0,0,0,1,0,0,0,0;2,0,1,2,0,0,0,0];
c_min = min([A(:); B(:)]);
c_max = max([A(:); B(:)]);
figure;
t = tiledlayout(1,2,'TileSpacing','compact','Padding','compact');
nexttile;
imagesc(A);
clim([c_min c_max]);
title('A','FontWeight','bold','FontSize',12,'FontName','Helvetica');
nexttile;
imagesc(B);
clim([c_min c_max]);
title('B','FontWeight','bold','FontSize',12,'FontName','Helvetica');
cb = colorbar;
cb.Layout.Tile = 'east';
