The pin layout is the same for TL074 and TL084.
The are datasheets from different companies... where did you download yours from? TI decribed the TL074 as the low-noise version of the TL084, but I didn't find further explanations, since the spectral density of the equivalent input noise voltage is the same for the two devices.
When I evaluate noise I like to know both voltage and current noise spectral densities of the op amp.
However the total noise in an operational circuit is often dominated by thermal noise (resistors). If you want to minimize noise, assuming that there is a voltage source, you have to 1) keep resistance values low and minimize the number of resistors (if dc accuracy is not required, don't use balancing resistors); 2) minimize source resistance; 3) choose a bipolar input op amp for low source resistance (up to 10 kohm); 4) minimize the input capacitance (it increases the noise gain with resonant peaking).
With current sources it is different.